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At the 2013 election, Mr Slipper's Queensland seat of Fisher went to Mr Brough.

Cabinet secretary Arthur Sinodinos, who voluntarily stepped aside as assistant treasurer when called to the NSW corruption commission over a donation to the Liberal Party, said Mr Brough's case was more like that of Opposition Leader Bill Shorten who was summoned to give evidence at the unions Royal Commission.

"If Mr Shorten was so worried about the standards of parliament, why didn't he stand aside when he knew he was coming before the Royal Commission," he said.